Answer :

Step 1: Write down the decimal divided by 1, like this: decimal/1Step 2: Multiply both top and bottom by 10 for every number after the decimal point. (For example, if there are two numbers after the decimal point, then use 100, if there are three then use 1000, etc.)Step 3: Simplify  (or reduce) the fraction . ( Did That Help ? ) 
fraction divide e.g. 7/20 is 7 divide by 20 equals 0.35.
in decimals you times it by 100
e.g. 0.35 x 100 equals 35%

and if your trying to find the fraction all yoju do is do the oposite